Nothing shows real commitment to fighting climate change like blocking affordable electric vehicles and solar panels, while still subsidizing fossil fuel industries.
On a per capita basis, China doesn't even make the top 20. Interestingly, the data are out there but no one seems to have made a visualization yet. I'll take a crack at it later.
I think Canada just gets away with having a tiny population - at 38 million, they're at roughly 5% of the combined US/EU population. Higher cumulative per capita emissions than the US, though.
Almost certainly the biggest. The things I've seen in China are mind-blowing. We were on the road and I thought I was looking at the sea, or a lake. Turned out it was a huge solar farm at the base of a mountain. It took us about 20 minutes to drive past it at around 100km/h. It was still being built. This was in Xinjiang. They have wind farms that stretch for tens to hundreds of kilometres too.